diff --git a/src/app/layout.tsx b/src/app/layout.tsx
index 00b89a0..392d37b 100644
--- a/src/app/layout.tsx
+++ b/src/app/layout.tsx
@@ -16,6 +16,7 @@ const notojp = Noto_Sans_JP({
 });
 
 export const metadata: Metadata = {
+  metadataBase: new URL(SITE_URL),
   title: {
     default: SITE_NAME,
     template: `%s - ${SITE_NAME}`,